#!/usr/bin/env python2.7
# -*- coding: utf-8 -*-
'''
Created on 20/08/2013 by Jesper Hertel

@author Lennart Regebro
Copied from http://regebro.wordpress.com/2010/12/13/python-implementing-rich-comparison-the-correct-way/.
'''

class ComparableMixin(object):

    def _compare(self, other, method):
        try:
            return method(self._cmpkey(), other._cmpkey())
        except (AttributeError, TypeError):
            # _cmpkey not implemented, or return different type,
            # so I can't compare with "other".
            return NotImplemented

    def __lt__(self, other):
        return self._compare(other, lambda s,o: s < o)

    def __le__(self, other):
        return self._compare(other, lambda s,o: s <= o)

    def __eq__(self, other):
        return self._compare(other, lambda s,o: s == o)

    def __ge__(self, other):
        return self._compare(other, lambda s,o: s >= o)

    def __gt__(self, other):
        return self._compare(other, lambda s,o: s > o)

    def __ne__(self, other):
        return self._compare(other, lambda s,o: s != o)
    